How to handle keyboard events?

Question

Java

I'm trying to make the simplest autoclicker. I can’t figure out how to make it so that when a given key is pressed (in my code it’s space), a click is made.
Here is the test code:

public class Main extends Application {
Stage window;
Robot robot;
Scene scene;
 
public static void main(String[] args) {
    launch(args);
}
 
@Override
public void start(Stage primaryStage) throws Exception {
    window = primaryStage;
    window.setTitle("Кликер");
 
    StackPane layout = new StackPane();
    robot = new Robot();
 
 
    scene = new Scene(layout, 200, 100);
    window.setScene(scene);
    window.show();
 
 
}
public void keyPressed(KeyEvent e){
    if (e.getKeyCode()==KeyEvent.VK_SPACE) {
        for (int i = 0; i < 3; i++) {
            robot.mousePress(InputEvent.BUTTON1_MASK);
            robot.delay(300);
            robot.mouseRelease(InputEvent.BUTTON1_MASK);
            robot.delay(300);
        }
    }
 
 
}
}

Answer 1

Problem solved. I used awt KeyListener library but didn't implement 3 methods keyPressed, keyReleased, keyTyped for it. So I used the javafx.scene.input.KeyEvent library.
In order to listen to the spacebar in JavaFX, I used the following code:

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.scene.input.KeyEvent;

import java.awt.Robot;
import java.awt.event.InputEvent;


public class Main extends Application {
    Stage window;
    Robot robot;
    Scene scene;

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        window = primaryStage;
        window.setTitle("Кликер");

        StackPane layout = new StackPane();
        robot = new Robot();

        scene = new Scene(layout, 200, 100);
        window.setScene(scene);
        window.show();

        scene.setOnKeyTyped(new EventHandler<KeyEvent>() {
            public void handle(KeyEvent ke) {
                if (ke.getCharacter().equals(" "))
                    for (int i = 0; i < 3; i++) {
                        robot.mousePress(InputEvent.BUTTON1_MASK);
                        robot.delay(300);
                        robot.mouseRelease(InputEvent.BUTTON1_MASK);
                        robot.delay(300);
                    }
            }
        });

    }
}

You will not be able to catch action buttons (such as Ctrl, Shift, function buttons, etc.) this way. But setOnKeyPressed and setOnKeyReleased will catch them too. So feel free to replace this line with
this
Or this
And let's replace the check for pressing the F12 button with this line
if (ke.getCode().getName().equals("F12"))